United States Armed Forces

====Space domain awareness====
{{main|Space Delta 2}}
[[File:15th SPSS- The neighborhood watch of space (7542481).jpeg|thumb|[[15th Space Surveillance Squadron]] [[Ground-based Electro-Optical Deep Space Surveillance|GEODSS]] telescope at [[White Sands Missile Range]]]]
The Space Force's Space Delta 2 operates the [[United States Space Surveillance Network]], tracking 47,000 objects in space as of 2022.<ref>{{cite web | url=https://www.defense.gov/News/News-Stories/Article/Article/3196701/us-space-command-to-transfer-space-object-tracking-to-department-of-commerce/#:~:text=Right%20now%2C%20U.S.%20Space%20Command,there%2C%20the%20Spacecom%20commander%20said | title=U.S. Space Command to Transfer Space Object Tracking to Department of Commerce }}</ref><ref>{{Cite web|url=https://www.nellis.af.mil/News/Article/2564700/space-delta-2-monitors-deep-space/https%3A%2F%2Fwww.spacebasedelta1.spaceforce.mil%2FNewsroom%2FNews%2FArticle-Display%2FArticle%2F2564700%2Fspace-delta-2-monitors-deep-space%2F|title=Space Delta 2 monitors deep space|website=Nellis Air Force Base}}{{Dead link|date=May 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Space domain awareness encompasses the identification, characterization, and understanding of any factor associated with the space domain that could affect space operations.<ref name="Spacepower"/>

Space Delta 2 sensors include the [[AN/FPS-85]] phased array radar at [[Eglin Air Force Base]] and the [[Space Fence]] radar at Kwajalein Atoll operated by the [[20th Space Surveillance Squadron]], and a global network of three [[Ground-based Electro-Optical Deep Space Surveillance]] telescopes operated by the [[15th Space Surveillance Squadron]].<ref>{{cite web | url=https://www.eglin.af.mil/News/Article-Display/Article/391473/ | title=Premier space surveillance squadron located at Eglin | date=12 December 2011 }}</ref><ref>{{cite web | url=https://www.lockheedmartin.com/en-us/products/space-fence.html | title=Space Fence | date=7 March 2023 }}</ref><ref>{{cite web | url=https://www.afspc.af.mil/About-Us/Fact-Sheets/Article/249016/ground-based-electro-optical-deep-space-surveillance/ | title=Ground-Based Electro-Optical Deep Space Surveillance | access-date=4 March 2023 | archive-date=4 March 2023 | archive-url=https://web.archive.org/web/20230304180422/https://www.afspc.af.mil/About-Us/Fact-Sheets/Article/249016/ground-based-electro-optical-deep-space-surveillance/ | url-status=dead }}</ref>

The [[18th Space Defense Squadron]], collocated with the [[Combined Space Operations Center]], executes command and control of the Space Surveillance Network and manages the [[Satellite Catalog Number|Space Catalog]] of all objects in Earth orbit. The [[19th Space Defense Squadron]] focuses on objects further in [[cislunar space]], beyond [[geosynchronous orbit]], with a specific focus on supporting [[NASA]]'s [[Artemis program]] and other human spaceflight operations.<ref>{{cite web | url=https://www.afcea.org/signal-media/space-force-rounds-out-delta-2s-structure | title=Space Force Rounds Out Delta 2's Structure | date=4 May 2022 }}</ref>